> I don't know any electronic source with full coverage of the players,
> not to mention full scope of playing statistics.

I compared the rosters (player names for each team-season) published by
Thompson and Nemec and sent the differences --one difference in each of
five teams-- to David Nemec with comments. I will pursue this with a
focus on whether there is a consensus among those who have studied AL1900,
regarding the list of players and their teams. If no consensus of the
experts, is a "best guess" clear to me?

Because 1900 is a gap in the MLB career of many players, and because of
what the reconstituted league accomplished, AL1900 should have some
priority over other minor leagues. Maybe the record of affiliations
between players and teams is valuable to others (it is to me), even
without playing statistics.

Wayman reported a count of 201 players and a count of 126 with NL
experience through 1900. By my count, Thompson listed 200 in 1967 and
David Nemec has 202, including Thompson's 200 and two others. For the
200 in common, the list of teams is identical.